in fact, i just got an email from someone in afghanistan, major general jim mcconville, who is there with our troops. we know historically, the chechens have had activity in afghanistan. but there doesn't seem to be any evidence of any threats on our soil here in the united states, from the chechens. this would be something new. and the question we will have to learn, as they review everything, including all the activities of these two brothers on the day of the marathon and since, is whether or not they had contact with anyone outside of the united states, any known jihaddists or terror groups. we did see them remove a computer today from the sister of the two brothers. perhaps there will be in -- will be some evidence there. one captured, in the hospital, having surgery right now. the younger of the two. one killed in a shootout with police that happened a day ago. and the question now, gregg, is whether or not they are connected. let's ask dr. walead farris, a fox news terrorism analyst. how important is it to find out what kecks they have, beyond each other? >> oh, very important